Valve-operating mechanism



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Patented Mar. 8, 1927.

UNITED. STATES PAr r orrlca;

GEORGE E. A. HALLETT, F DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS RESEARCH CORPORATION, OF DAYTON, OHIO, A CORPORATION OF DELAWARE.

VALVE-OPERATING MECHANISM.

' Application filed November 24, 1924. Serial No. 751,778.

This invention relates to improvements in valve mechanism for internal-combustion en gines and more particularly to such mechanisms including poppet valves.

It is among the'objects of the present invention to prevent lateral thrusts on the stem of the poppet valve during the operation thereof, thereby substantially reducing the wear on the valve stem and its bearing.

lubricant on the valve operating mechanism from dripping upon the valve stem or engine head which Wlll cause gumming and sticking of the valve and produce obnoxious odors of 1 burnin oil respectively.

A still further-object is to maintain the entire valve mechanism as cool as possible.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings, wherein a preferred form of the present invention is clearly shown. a

In the drawings: Fig. 1 is a' detail View showing the valve mechanism housing and one of the valve operating devices in section while the adjacent valve operating device is shown in elevation; I

Fig. 2 is a side view of the Fig. 1, certain parts being shown in section.

Referring to the drawings, the numeral 20 designates the head of an engine cylinder provided with poppet valves including stems 21 and 22, supported in bearing-guides 23 and 24. The valve is moved into engagement with its valve seat by means of a spring 25, interposed between two abutment collars 26 and 27. The collar 26 rests on a shelf formed on the valve-stem guide 23, while the spring 25 holds the collar in-engagement with the split washer 28, which is inserted in the circumferential groove 29 formed near the endof the valve stem. I

A housing 30 is secured to the top of the cylinder structure by means of feet 31. These feet project beyond the lower surface of said housing, thereby providing a space 32 between said housing and the cylinder structure. Air may flow through this space and aid in keeping the valve mechanism and this portion of the cylinder structure cool. The housing is adapted to support the rockerarm shaft 33 which in turn is provided with a pair of rocker arms each comprising a hub Another object is to prevent the excess portion 34: having two oppositely-disposed lever arms 35 and 36. The lever arm 35 is in driving connection with the engine cam ghaft (not shown) by means of the push rod The housing 30 comprises also a pair of cylinders 38 each of which is provided with a cup-shaped plunger 39 slidably arranged therein in an inverted position. The upper inside surface or ceiling of the plunger engages with the end of the va'lve stem both having a common axis. The end of lever arm 36 of the rocker arm is adapted to engage with the outer surface of the plunger approximately at. its center.'

From the aforegoing it will be seen that the plunger 39 which is adapted to slide in the cylinders 38, axially with the valve stem,

apron 40 is provided in each of the cylinders 38, the larger portion of the element tightly fitting in the lower end of the cylinder While the reduced portion extends into the cup-shaped plunger. This forms a circular space 41 between said element and the inside wall of the cylinder. 'A drain hole 42 is provided in the cylinder wall forming communication between the outside of the cylinder and the space 41.

This space is adapted to catch any excess lubricating oil applied to lubricate the plunger and cylinder contacting surfaces and prevent this excess of oil from dripping onto the valve stem and cause gumming and sticking thereof. 1

The drain hole 42 will permit the oil to ice flow from the space 41.

The housing is provided with walls 43 forming a pan-like structure in which drippings of excess oil on the rocker arms can be accumulated from whence this oil may 1105 i mechanism of the engine will be prevented from reaching the engine thereby eliminating the obnoxious smell caused by permit ting oil to drop on a hot engine.

the poppet valve; means capable of move ment only axially of the valve interposed between the valve and rocker arm whereby lateral thrust on the valve stem is eliminated and stationary means associated withtthe first named means adapted to co-operate with the wall of the said bore to form an outer annular chamber for receiving excessive lubricant from the said first named means.

2. A valve .mechanism for an internalcombustion engine comprising, in combination,'a poppet valve; a rocker arm for operating the poppet valve; a housingsupported on the engine, adapted to support the rocker arm. and including a cylindric orifice into which a part of the poppet valve extends; and a plunger in said cylindric orifice interposed between the valve and the rocker arm, said plunger being movable axially of the .valve to substantially eliminate lateral thrust on the valve stem and a cylinder adapted to engage the wall of the said orilice and formed with an upper reduced portion for making with said-wall an annular oil drip chamber.

3. A valve mechanism for an internalcombustion engine comprising, in combination, a housing having feet for supporting it on the engine and providing. a space between the engine and housing proper andincluding a cylindrical portion; a rocker arm supportedby the housing; a' poppet Valve including a stem which extends into the cylindrical portion of the housing; a cupshaped plunger, slidably arranged in the cylindrical portion and interposed between the rocker arm and the valve stem; a funnelshaped member provided in the cylindrical portion, the larger portion of said member fitting tightly in said portion while the smaller portion extends into the opp-shaped plunger, thereby forming a chamberbetween the funnel member and its containing cylinder; and draining means in the cylinder portion of the housing communicating with said chamber. v

4. Valve operating mechanism for operating engine valves of the poppet type comprising, in combination, a frame adapted to be attached to the engine cylinder block;

valve operating mechanism including rocker arms supported by the frame; a single cap and a cylindrical apron included on the frame formed to extend into the cap for preventing excessive lubricant of the valve operating mechanism from coming in contact with the cylinder block.

5. Valve operating mechanism for operating engine valves of the poppet type comprising, in combination, a frame adapted to be attached to the engine cylinder block; valve operating mechanism including rocker arms supported by the frame; an actuating cap, andmeans extending into thesaid cap and included on the frame for preventing excessive lubricant of the valve operating mechanism from coming in contact with the cylinder block and the stems of the poppet valves.

6. The combination of a valve stem, a valve stem housing therefor including a cylindrical bore constructed to receive the said stem in spaced relation with respect to the walls of the said bore, a cap adapted to slide within the said bore and transmit solely in an axial direction the thrusts imparted thereto, means to engage and operate the cap, a cylindrical apron fixedly mounted at the lower end of the said bore. and forming an oil tightv connection therewith, the said apron serving in co-operation with the wall of the said bore to form an annular chamber for directing particles of dirt and excessive lubricant into and adjoining the drainage chamber.

7. The combination of a valve stem, a valve stem housing therefor, including a cylindrical bore constructed. to receive the said stein in spaced relation with respect to the walls of the said bore, a cap adapted to slide within the said bore and transmit solely in an axial direction the thrusts imthe cap; a valve spring, an apron carried at the lowerv extremity of the said bore and ex tending upward in reduced proportions so as to loosely fit the said cap and provide a 1 parted thereto, means to engage and operate bust-ion engines comprising in combination,

a frame adapted to be attached to the engine cylinder block, a rocker arm supported in the said frame, a poppet valve including a stem which extends into a cylindrical bore .of the said housing, a cup shaped plunger slidably arranged in the upper end of the bore of the housing and-actuated by the said rocker arm; means fixedly attached to the lower end of the said bore and havin an upward reduced extension for provi ing, with the wall of the said bore, an annular chamber in which the said cup shaped plunger operates and forming a detention chamber for oil drippings; and draining means in the said housing adjacent the wall stem which extends into a cylindrical bore of the said housing, a cup shaped plunger slidably arranged in the upper end of the bore of the housing and actuated by the said lower end-of the said bore and having an uprocker arm; means fixedly attached to the ward reduced extension for providing, with the wall of the said bore, an annular chamber in which the said cup shaped plunger operates; a tubular member carried at the lower end of the said bore and providing an oil tight connection with the wall thereof and extending upwardly in reduced proportions into the said cup shaped plunger for constituting with the wall of the said here a lubricant, receiving chamber; and means formed in the said housing adjacent the wall of the said bore communicating with the said chamber for draining the latter.

In testimony whereof, I hereto atfixmy signature.

GEORGE E. A. HALLETT. 

